摘要
针对飞行器空天往返、多次使用的发展需求,以2D-C/SiC材料为对象,选择开放大气模拟环境、800℃温度条件开展了常/高温拉伸试验、以及常温→高温→降温循环变化历程下拉-拉疲劳的耦合试验,得到不同的力学性能规律,分析了影响材料表面涂层完整性的控制因素及转化点。表明C/SiC材料具有优良的高温静态持续强度性能,但在常-高温循环变化历程下的疲劳性能明显衰减。采用剩余刚度衰减模型,提出了力-热-氧耦合时考虑常-高温循环历程影响因素、以及氧化尺寸效应影响的疲劳剩余性能评估方法。
Aimed at the development requirement and repeatable use in space shuttle, the tensile tests in the oxidation simulation environment of open atmosphere with room temperature and 800 ℃ are proposed for the 2 D-C/SiC composite material. The coupling test by room temperature-high temperature-room temperature cycle process with tension-tension fatigue load is done. The regulation of mechanical character in different conditions is obtained. The control factor affecting the integrality of surface coating for C/SiC specimen and the translating point are analyzed. A fine static durative strength character is shown for the material in high temperature environment, but the fatigue character is declined evidently during the process of cycling. Based on the model of residual stiffness, a new modified fatigue life prediction method is given fitted for mechanical-thermal-oxidation coupling condition, in which the factor of cycling process from normal to high temperature and the dimensional size factor affecting the sample’s oxidation are considered.
作者
谭志勇
王捷冰
张毅
李彦斌
徐聪
TAN Zhi-yong;WANG Jie-bing;ZHANG Yi;LI Yan-bin;XU Cong(Science and Technology on Space Physics Laboratory,Beijing 100076,China;School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an 710072,China;School of Mechanical Engineering,Southeast University,Nanjing 211189,China)
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2021年第12期1590-1599,共10页
Journal of Astronautics
基金
国家自然科学基金(U20B2002,11802059,52175220)
国防技术基础科研项目(JSZL2019203B003)
江苏省自然科学基金(BK20211558)
东南大学“至善青年学者”支持计划(4302002156)。
作者简介
谭志勇(1965-),男,博士,研究员,主要从事飞行器结构强度方面的研究。通信地址:北京9200信箱89分箱(100076)电话:(010)88537192,E-mail:tanzhy_01@163.com;通信作者:李彦斌(1986-),男,博士,副教授,主要从事飞行器结构强度方面的研究。通信地址:江苏省南京市江宁区东南大学路2号(211198)电话:(025)52090521,E-mail:LYB@seu.edu.cn。
